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플래너 밀러 재제조를 위한 역설계 및 마모 분석에 관한 연구
최두한,공석환,변정원,김태우,홍대선 한국산업융합학회 2022 한국산업융합학회 논문집 Vol.25 No.6
The old machine tools that have been used for a long time cause both increase in defective rate and decrease in productivity compared to new machines due to wear and failure of their components. In order to improve productivity and quality of machined components through remanufacturing, it is necessary to analyze the wear and failure of major components of old machine tools. In this study, the process for reverse engineering is designed for the remanufacture of planner millers, which belong to a very large machine tool. Also, the suitability of the designed process is verified through the analysis of the selected remanufactured components. In the first step of the process, some major components of the aging planner miller are scanned using a 3D laser scanner. In the next step, reverse engineering is performed using the data obtained through 3D scanning. Finally, wear and failure analysis is performed by comparing the reverse engineering data with the scan data. As a result, this reverse design and wear analysis can complement the insufficient design database and reduce costs in the maintenance of remanufactured products.
Analysis of queueing model with priority scheduling by supplementary variable method
최두일 한국전산응용수학회 2013 Journal of applied mathematics & informatics Vol.31 No.1
We analyze queueing model with priority scheduling by supplementaryvariable method. Customers are classified into two types (type-1 and type-2 ) according to their characteristics. Customers of eachtype arrive by independent Poisson processes, and all customers regardlessof type have same general service time. The service order of each typeis determined by the queue length of type-1 buffer. If the queue lengthof type-1 customer exceeds a threshold L, the service priority is given tothe type-1 customer. Otherwise, the service priority is given to type-2customer. Method of supplementary variable by remaining service timegives us information for queue length of two buffers. That is, we derive thedifferential difference equations for our queueing system. We obtain jointprobability generating function for two queue lengths and the remainingservice time. Also, the mean queue length of each buffer is derived.
활성글루텐이 1차발효 후 냉동한 생지의 품질특성에 미치는 영향
최두리,이정훈,윤여창,이시경,Choi, Doo-Ri,Lee, Jeong-Hoon,Yoon, Yoh-Chang,Lee, Si-Kyung 한국식품과학회 2005 한국식품과학회지 Vol.37 No.1
활성글루텐을 0, 2, 4% 첨가하여 제조한 냉동생지를 8주간 냉동보존하면서 1주 단위로 생지의 효모균수와 냉동생지를 해동 발효 굽기로 제품을 제조하였다. 냉동자당기간에 따른 생지의 효모 생존율과 제품의 비용적, 부피, 조직감, 관능검사 등을 분석하였다. 생지의 효모균수은 냉동저장기간이 경과하여도 활성글루텐 4% 첨가한 생지에서 저장 8주에 $4.4{\times}10^{6}\;cfu/g$로 가장 높게 검출되었다. 제품의 비용적과 부피는 활성글루텐을 4% 첨가한 냉동생지가 컸고, 조직감은 저장 4주까지는 활성글루텐을 첨가하지 않은 냉동생지가 더 부드러웠으며, 관능검사는 활성글루텐 4% 첨가한 냉동생지가 높은 점수를 얻어 1차 발효 후 냉동생지 제조에 활성글루텐 4% 첨가가 좋은 것으로 나타났다. Frozen dough made by sponge and dough method using sweet dough formula was quickly frozen at $-40^{\circ}C$ and stored for 8 weeks at $-20^{\circ}C$. Effects of vital wheat gluten on number of yeast cells, bread volume, specific loaf volume, hardness, and sensory properties of bread were investigated. Dough added with 4% vital wheat gluten showed higher yeast cell survival rate during freeze storage and larger specific loaf volume than other doughs. Hardness value increased with increasing amount of vital wheat gluten added, whereas, in frozen dough stored more than 4 weeks, dough added with 2% vital wheat gluten showed lower hardness value than others. Bread made with 4% vital wheat gluten showed highest sensory score.
Performance analysis of the leaky bucket scheme with queue length dependent arrival rates
최두일,이상한 대한수학회 2006 대한수학회보 Vol.43 No.3
In this paper, we analyze a leaky bucket (LB) schemewith queue length dependent arrival rates. In other words, if thequeue length exceeds an appropriate threshold value on buer, thearrivals need to be controlled. In ATM networks, if the congestionoccurs, the input tracs must be controlled (reduced) for conges-tion resolution. By the bursty and correlated properties of tracs,the arrivals are assumed to follow a Markov-modulated Poisson pro-cess (MMPP). We derive the loss probability and the waiting timedistribution for arbitrary cell. The analysis is done by using theembedded Markov chain and supplementary variable method. Wealso present some numerical examples to show the eects of ourproposed LB scheme.
최두일,윤태성 대한의용생체공학회 1987 의공학회지 Vol.8 No.2
In this study, basilar membrane motions and neural tuning responses are analysed with I-dimensional equations for cochlear fluid mechanics and an active cochlear model. The results are as follows. (1) The differences between basilar membrane motions in an active cochlear model and in an passive cochlear model are explained. (2) The basilar membrane motion curves and the neur'at tuning curves which are in accordance with physiological measurements ave obtained. (3) It is proved that the active mechanism makes cochlear highly frequency sensitive.